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Concept explainers
Callahan (2009) demonstrated that tai chi can significantly reduce symptoms for individuals with arthritis. Participants were 18 years old or older with doctor-diagnosed arthritis. Self-reports of pain and stiffness were measured at the beginning of an eight-week tai chi course and again at the end. Suppose that the data produced an average decrease in pain and stiffness of MD = 8.5 points with a standard deviation of 21.5 for a sample of n = 40 participants.
a. Use a two-tailed test with α = .05 to determine whether the tai chi had a significant effect on pain anti stiffness.
b. Compute Cohen’s d to measure the size of the treatment effect.
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Chapter 11 Solutions
Bundle: Essentials Of Statistics For The Behavioral Sciences, 9th + Aplia, 1 Term Printed Access Card
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill
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